import 'package:flutter/material.dart';
import 'dart:async';

import 'package:flutter/services.dart';
import 'package:flutter_plugin_demo/flutter_plugin_demo.dart';

void main() => runApp(MyApp());

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  String _platformVersion = 'Unknown';
  String _testArgMsg = 'Unknown';
  String _testArgArrMsg = 'Unknown';
  double _volume = 0;

  @override
  void initState() {
    super.initState();
    initPlatformState();

    FlutterPluginDemo.enableWatcher();
    FlutterPluginDemo.listener((result) {
      setState(() {
        _volume = result;
      });
      return;
    });
  }

  // Platform messages are asynchronous, so we initialize in an async method.
  Future<void> initPlatformState() async {
    String platformVersion;
    String testArgMsg;
    String testArgArrMsg;
    // Platform messages may fail, so we use a try/catch PlatformException.
    try {
      platformVersion = await FlutterPluginDemo.platformVersion;
      testArgMsg = await FlutterPluginDemo.testArg;
      testArgArrMsg = await FlutterPluginDemo.testArgArr;
    } on PlatformException {
      platformVersion = 'Failed to get platform version.';
      testArgMsg = '';
      testArgArrMsg = '';
    }

    // If the widget was removed from the tree while the asynchronous platform
    // message was in flight, we want to discard the reply rather than calling
    // setState to update our non-existent appearance.
    if (!mounted) return;

    setState(() {
      _platformVersion = platformVersion;
      _testArgMsg = testArgMsg;
      _testArgArrMsg = testArgArrMsg;
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Plugin example app'),
        ),
        body: Column(
          children: <Widget>[
            Center(
              child: Text('Running on: $_platformVersion\n'),
            ),
            Center(
              child: Text('Running on: $_testArgMsg\n'),
            ),
            Center(
              child: Text('Running on: $_testArgArrMsg\n'),
            ),
            Center(
              child: Text('Running on: $_volume\n'),
            ),
            Expanded(
              child: PlatformTextWidget(text: "PlatformTextWidget"),
            ),
          ],
        ),
      ),
    );
  }
}
